Mechanical properties of recycled aggregate concrete under uniaxial loading

Xiao, Jianzhuang; Li, Jiabin; Zhang, Chuanzeng

doi:10.1016/j.cemconres.2004.09.020

Cited by 888 publications

(360 citation statements)

References 8 publications

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“…Recycled concrete aggregates (RCA) are composed of an intimate mix between aggregates and hardened cement paste [7][8][9][10]. The fine fraction of RCA (FRCA), essentially composed of mortar and hardened cement paste, possesses a large water demand which makes it harder to recycle into concrete and mortar compared to coarser RCA [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Influence of fine recycled concrete aggregates on the properties of mortars

Zhao

Rémond

Damidot

et al. 2015

Construction and Building Materials

226

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h i g h l i g h t sInfluences of saturation state of FRCA on the mortars' properties are studied. Mortars made with dried FRCA present larger slump and better mechanical properties. Compressive strength of mortars decreases quasi linearly with substitution rate. Fraction 0/0.63 mm of FRCA has a worse effect on mechanical properties of mortars. a r t i c l e i n f o b s t r a c tFine recycled concrete aggregates (FRCA) also called recycled sand, having particle sizes smaller than 5 mm, are essentially composed of mortar and hardened cement paste. Therefore they induce a large water demand which makes them hard to recycle into mortar and concrete. In this paper, the properties of mortars containing FRCA have been studied, including fresh properties, mechanical properties and interfacial transition zone (ITZ) microstructure.The influence of saturation state of FRCA (dried or saturated) on the properties of mortars of identical compositions has first been studied. The results showed that the slump of mortars containing dried FRCA is always larger than that of mortars containing saturated FRCA. Indeed, in the case of dried FRCA, the theoretical amount of absorbed water is added at the beginning of mixing leading to a temporary increase of the initial efficient W/C ratio and volume of paste, leading to a better workability before its absorption into FRCA. On the contrary, the absorbed water in saturated FRCA is not readily available and thus cannot contribute to increase the initial efficient W/C ratio. Moreover, the compressive strength of mortars containing dried FRCA is always larger than that of mortars made with saturated FRCA, which is attributed to a thinner interfacial transition zone improving its mechanical properties. The influence of the fraction of recycled sand and of the granular class of recycled sand on the mechanical properties of mortars has then been studied with saturated FRCA. The compressive strength of mortars decreases quasi linearly as the replacement percentage of recycled sand increases. Moreover, it is shown that the finer fraction of recycled sand (0/0.63 mm) has the worse effect on the mechanical properties of mortars.

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Section: Introductionmentioning

confidence: 99%

Influence of fine recycled concrete aggregates on the properties of mortars

Zhao

Rémond

Damidot

et al. 2015

Construction and Building Materials

226

View full text Add to dashboard Cite

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“…As shown in Figure 2, demolition and landfilling strategy, if adopted, not only does not preserve the embodied carbon invested to convert the material into an integrated structure but also results in additional carbon emissions during the demolition of the building and the transportation of debris to remote landfills [20]. The recycling strategy is, on the other hand, one of the oldest sustainable strategies to deal with construction and demolition waste [81][82][83][84][85][86][87][88]. Concrete recycling has been highlighted as an effective strategy to reduce carbon emissions and costs incurred in transporting and dumping of debris at remote landfills, reducing the need for the landfill space and providing a sustainable source of alternative aggregate [75,88,89].…”

Section: Materials Reuse and Recyclingmentioning

confidence: 99%

Estimation and Minimization of Embodied Carbon of Buildings: A Review

2017

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Building and construction is responsible for up to 30% of annual global greenhouse gas (GHG) emissions, commonly reported in carbon equivalent unit. Carbon emissions are incurred in all stages of a building's life cycle and are generally categorised into operating carbon and embodied carbon, each making varying contributions to the life cycle carbon depending on the building's characteristics. With recent advances in reducing the operating carbon of buildings, the available literature indicates a clear shift in attention towards investigating strategies to minimize embodied carbon. However, minimizing the embodied carbon of buildings is challenging and requires evaluating the effects of embodied carbon reduction strategies on the emissions incurred in different life cycle phases, as well as the operating carbon of the building. In this paper, the available literature on strategies for reducing the embodied carbon of buildings, as well as methods for estimating the embodied carbon of buildings, is reviewed and the strengths and weaknesses of each method are highlighted.

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“…There is a large amount of Ca(OH) 2 enrichment and orientation in the interfacial transition zone, which is the weakest link of concrete, and the influence of interfacial transition zone on the mechanical properties and durability of concrete is significant [1,2,3,4] .The interfacial transition zone is an area with complex structure, which is difficult to be distinguished. The factors that affect the composition and structure of the region are very complex.…”

Section: Introductionmentioning

confidence: 99%

Application of Microhardness Analysis in Multiple Interface Structure of Recycled Concrete

Li¹,

Li²,

Yue³

2017

Proceedings of the 2017 2nd International Conference on Civil, Transportation and Environmental Engineering (ICCTE 2017)

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Abstract. Compared with ordinary concrete, recycled concrete has multiple weak interface structure, which is the main reason for the low performance of recycled concrete. Based on the construction of the recycled concrete multi interface model, the vivtorinox hardness of three kinds of interface structure of recycled concrete was tested by Micro Vickers Hardness Tester, in order to characterize the microstructure characteristics of recycled concrete interfacial transition zone. The results show that the microhardness and the width of the interface transition zone can be accurately measured and analyzed by Micro Vickers Hardness Teste after the existing models are sliced, pre grinded and polished. It can be seen that the Micro Vickers Hardness Tester provides a scientific and effective research method for the study of recycled concrete interfacial transition zone.

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Mechanical properties of recycled aggregate concrete under uniaxial loading

Cited by 888 publications

References 8 publications

Influence of fine recycled concrete aggregates on the properties of mortars

Influence of fine recycled concrete aggregates on the properties of mortars

Estimation and Minimization of Embodied Carbon of Buildings: A Review

Application of Microhardness Analysis in Multiple Interface Structure of Recycled Concrete

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